Owen Developments offer three stages of turbo upgrade to Vauxhall 2.0L turbo engines as fitted to the Mk. 5 Astra VXR and Zafira VXR. These upgrades are based on genuine Borg Warner K04 turbos and the standard VXR exhaust manifolds making these turbos bolt-on units.

All power figures given are approximate and assuming there are no other upgrades on the engine.